Abstract

A picosecond double-pass periodically poled KTiOPO4 (PPKTP) noncollinear parametric amplifier that delivers tunable and narrowband outputs between 1.1 µm and 1.65 µm is reported. The seed source is an ultra-broadband emitting PPKTP collinear parametric generator, which is spectrally narrowed, from a bandwidth of 80 THz to about 0.3 THz, by a Fourier-filtering arrangement. A parametric gain of 70 dB is measured with preserved spectral bandwidth, resulting in a signal energy of 6.5 µJ at a pump energy of 60 µJ from the Ti:sapphire regenerative amplifier. The total energy-budget for the setup is less than 100 µJ with an optical-to-optical efficiency of 12 %. This particular system is scalable to even lower pump energies by tighter focusing arrangements.

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